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tôi đang học Ruby (sử dụng phiên bản 1.8.6) trên Windows 7.Tại sao doesnt relative_require không hoạt động trên Ruby 1.8.6?
Khi tôi cố gắng chạy chương trình stock_stats.rb dưới đây, tôi nhận được lỗi sau:
C:\Users\Will\Desktop\ruby>ruby stock_stats.rb
stock_stats.rb:1: undefined method `require_relative' for main:Object (NoMethodE
rror)
tôi có ba file mã v.small:
stock_stats.rb
require_relative 'csv_reader'
reader = CsvReader.new
ARGV.each do |csv_file_name|
STDERR.puts "Processing #{csv_file_name}"
reader.read_in_csv_data(csv_file_name)
end
puts "Total value = #{reader.total_value_in_stock}"
csv_reader.rb
require 'csv'
require_relative 'book_in_stock'
class CsvReader
def initialize
@books_in_stock = []
end
def read_in_csv_data(csv_file_name)
CSV.foreach(csv_file_name, headers: true) do |row|
@books_in_stock << BookInStock.new(row["ISBN"], row["Amount"])
end
end
# later we'll see how to use inject to sum a collection
def total_value_in_stock
sum = 0.0
@books_in_stock.each {|book| sum += book.price}
sum
end
def number_of_each_isbn
# ...
end
end
book_in_stock.rb
require 'csv'
require_relative 'book_in_stock'
class CsvReader
def initialize
@books_in_stock = []
end
def read_in_csv_data(csv_file_name)
CSV.foreach(csv_file_name, headers: true) do |row|
@books_in_stock << BookInStock.new(row["ISBN"], row["Amount"])
end
end
# later we'll see how to use inject to sum a collection
def total_value_in_stock
sum = 0.0
@books_in_stock.each {|book| sum += book.price}
sum
end
def number_of_each_isbn
# ...
end
end
Cảm ơn trước sự giúp đỡ nào.
Đó là mã từ chương 3 trên sổ Pickaxe! –